| 摘要 |
1,138,925. Automatic exchanges. STANDARD TELEPHONES & CABLES Ltd. 16 June, 1967, No. 27787/67. Heading H4K. To divert calls at the exchange intended for a certain subscriber (the transferor) to a predetermined other subscriber (the transferee), the transferor dials into the exchange from his own line a transfer request code plus the coded identity of the transferee. From the identity of the calling transferor and the coded identity of the transferee, the transferee's full identity is obtained via a decoder addressing a common address store. The state of the transferee's line is then ascertained as to whether it can accept transferred calls. If not the transferor receives number unobtainable tone, otherwise the coded identity of the transferee is put into a store position permanently allocated to the transferor who then receives interrupted dial tone as an indication that the transfer facility has been set up and receives it each time he makes a call until the transfer facility is cancelled. For all incoming calls the last mentioned store is interrogated to ascertain whether the wanted line is in transfer. If so, the coded identity of the transferee is extracted and with the full identity of the transferor enables the full identity of the transferee to be obtained from the common address store to whom the call is then routed. If the transferee is in another exchange his identity may be sent back to the originating exchange or the call extended from the exchange already reached. To cancel the facility the transferor dials a cancel code. |
